排序方式: 共有176条查询结果,搜索用时 187 毫秒
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Michał Luczewski Izabella Bukraba-Rylska 《?sterreichische Zeitschrift für Soziologie》2008,33(1):89-104
Monographs of local communities are a genre of sociological craft which — along with analyses of personal documents — became a distinguishing mark of Polish empirical sociology. In 2003 turned exactly 100 years from publication of the first sociologically mature village monograph in Poland, e. g. “?mi?ca. Wie? powiatu limanowskiego. Stosunki gospodarcze i spo?eczne” [?mi?ca. A village of the Limanowa county. Economic and social relations] by one of the founding fathers of Polish social sciences, Franciszek Bujak. This paper describes and analyses the impacts of this study and develops a typology of monographs. Additionally, problems of representativeness of monographs are discussed. 相似文献
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This paper discusses method for constructing the prediction intervals for time series model with trend using the sieve bootstrap procedure. Gasser–Müller type of kernel estimator is used for trend estimation and prediction. The boundary modification of the kernel is applied to control the edge effect and to construct the predictor of a trend. 相似文献
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Koczkodaj Waldemar W. Mazurek Mirosław Strzałka Dominik Wolny-Dominiak Alicja Woodbury-Smith Marc 《Social indicators research》2019,141(2):861-871
Social Indicators Research - This study presents compelling social indicators of such magnitude that they cannot be ignored. The statistical evidence shows that data breaches of electronic health... 相似文献
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AbstractWe study the almost sure convergence of weighted sums of ratios of independent random variables satisfying some general, mild conditions. The obtained results are applied to exact laws for order statistics. An exact law for independent random variables which are nonidentically distributed is also proved and applied to ratios of adjacent order statistics for a sample of uniformly distributed random variables. 相似文献
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Mikołajczak Paweł 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2020,31(3):472-483
VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - Social enterprises have gained wide recognition as a tool for solving social and environmental problems. They generate new... 相似文献
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Paweł Marcin Kozyra 《Statistics》2018,52(1):177-204
We describe a method of determining upper bounds on the variances of linear combinations of the kth records values from i.i.d. sequences, expressed in terms of variances of parent distributions. We also present conditions for which the bounds are sharp, and those for which the respective lower ones are equal to zero. A special attention is paid to the case of the kth record spacings, i.e. the differences of consecutive kth record values. 相似文献
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Krista Byers-Heinlein Rachel Ka-Ying Tsui Daan van Renswoude Alexis K. Black Rachel Barr Anna Brown Marc Colomer Samantha Durrant Anja Gampe Nayeli Gonzalez-Gomez Jessica F. Hay Mikołaj Hernik Marianna Jartó Ágnes Melinda Kovács Alexandra Laoun-Rubenstein Casey Lew-Williams Ulf Liszkowski Liquan Liu Claire Noble Christine E. Potter Joscelin Rocha-Hidalgo Nuria Sebastian-Galles Melanie Soderstrom Ingmar Visser Connor Waddell Stephanie Wermelinger Leher Singh 《Infancy》2021,26(1):4-38
Determining the meanings of words requires language learners to attend to what other people say. However, it behooves a young language learner to simultaneously encode relevant non-verbal cues, for example, by following the direction of their eye gaze. Sensitivity to cues such as eye gaze might be particularly important for bilingual infants, as they encounter less consistency between words and objects than monolingual infants, and do not always have access to the same word-learning heuristics (e.g., mutual exclusivity). In a preregistered study, we tested the hypothesis that bilingual experience would lead to a more pronounced ability to follow another's gaze. We used a gaze-following paradigm developed by Senju and Csibra (Current Biology, 18, 2008, 668) to test a total of 93 6- to 9-month-old and 229 12- to 15-month-old monolingual and bilingual infants, in 11 laboratories located in 8 countries. Monolingual and bilingual infants showed similar gaze-following abilities, and both groups showed age-related improvements in speed, accuracy, frequency, and duration of fixations to congruent objects. Unexpectedly, bilinguals tended to make more frequent fixations to on-screen objects, whether or not they were cued by the actor. These results suggest that gaze sensitivity is a fundamental aspect of development that is robust to variation in language exposure. 相似文献
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We introduce a framework for estimating the effect that a binary treatment has on a binary outcome in the presence of unobserved confounding. The methodology is applied to a case study which uses data from the Medical Expenditure Panel Survey and whose aim is to estimate the effect of private health insurance on health care utilization. Unobserved confounding arises when variables which are associated with both treatment and outcome are not available (in economics this issue is known as endogeneity). Also, treatment and outcome may exhibit a dependence which cannot be modeled using a linear measure of association, and observed confounders may have a non-linear impact on the treatment and outcome variables. The problem of unobserved confounding is addressed using a two-equation structural latent variable framework, where one equation essentially describes a binary outcome as a function of a binary treatment whereas the other equation determines whether the treatment is received. Non-linear dependence between treatment and outcome is dealt using copula functions, whereas covariate-response relationships are flexibly modeled using a spline approach. Related model fitting and inferential procedures are developed, and asymptotic arguments presented. 相似文献
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In systems which serve many users there is a need to respect some fairness rules while looking for the overall efficiency. This applies among others to network design where a central issue is how to allocate bandwidth to flows efficiently and fairly. The so-called max–min fairness is widely used to meet these goals. However, allocating the bandwidth to optimize the worst performance may cause a large worsening of the overall throughput of the network. In this paper we show how the concepts of mult-criteria equitable optimization can effectively be used to generate various fair and efficient allocation schemes. We introduce a multi-criteria model equivalent to equitable optimization and we develop a corresponding reference point procedure to generate fair and efficient bandwidth allocations. Our analysis is focused on the nominal network design for elastic traffic that is currently the most significant traffic of IP networks. The procedure is tested on a sample network dimensioning problem for elastic traffic and its abilities to model various preferences are demonstrated. 相似文献